A student performed row operations on a matrix as shown below.
-4
1
2
4
-4
1
2
4
-1
3
1
-
0
-1
3
3
2
45
3
0
107
Which operations did the student perform?
2R2 + R3 R3
2R3+-R3 R3
2R2+R3 → R2 R3
2R2 R3

answer: 34rtyj,jkhtyetwrhyjeuiejnbhdfknbkguxfrbhkfdbjvkmbd,kvbsd.kxjvbhjnfbgjxdfn

step-by-step explanation:

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

3xy cannot be combined with the others

2x, -5x and x are like terms